There is a hidden readme file poco/README at master · pocoproject/poco · GitHub. I'm quoting:
Through the Poco/Crypto/Crypto.h and Poco/Net/NetSSL.h header files, Visual C++ will automatically link the libcrypto.lib and libssl.lib libraries. If your OpenSSL libraries are named differently, compile with the macro POCO_EXTERNAL_OPENSSL defined and edit the project files accordingly.
You can try to re-compile with the POCO_EXTERNAL_OPENSSL macro set accordingly (see Foundation/include/Poco/Config.h). (source)
Or what I did. Edit the file Crypto/include/Poco/Crypto/Crypto.h, remove all if-else logic around pragmas and leave only libraries that use have:
#pragma comment(lib, "libcrypto64md.lib") #pragma comment(lib, "libssl64md.lib")
